If you’ve experienced a twinge of guilt for supporting an idling, carbon-emitting vehicle while waiting on line for gourmet macaroni-and-cheese, rejoice—a new day is dawning for NYC food trucks. In late February, Mayor Bloomberg inaugurated Neapolitan Express, the first food truck fueled by compressed natural gas. The truck, (which looks a wee bit like a retirement home bus) is a showcase for kajillionaire T. Boone Pickens’ company Clean Energy Fuels. Track it @NeaExpress.